uglify

/ˈʌɡlɪfaɪ/

VERB

1. To make something ugly or unattractive

To change or damage the appearance of something so that it becomes less attractive, pleasing, or beautiful.

Making a person, object, or structure look unattractive by damaging, distorting, or spoiling its physical appearance.

The graffiti on the historic building does nothing but uglify its architectural charm.
The heavy rain damaged the landscaped garden and threatened to uglify its appearance.

Making a design, artwork, or visual composition less attractive by adding inappropriate elements, excessive details, or unsuitable modifications.

Adding unnecessary details to the design may actually uglify the simplicity of the product.
His attempt to enhance the painting only seemed to uglify its original beauty.

Making an otherwise positive interaction, discussion, or situation less pleasant through negativity, hostility, or inappropriate behavior.